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Variability of the δ13C of dissolved inorganic carbon at a site in the north Pacific Ocean


We present a depth profile of δ13C-DIC (dissolved inorganic carbon) and a time-series of surface water δ13C-DIC from seawater samples collected at a single site during the Eve cruise in the North Pacific in June of 1987. Our deep water results confirm those reported by Kroopnick (1985) for GEOSECS Station 213 (10° west of Eve site). We observed a small but significant decrease in the δ13C of DIC in the upper 500 m of the water column over 13 years since the GEOSECS survey. This is likely due, at least in part, to the input of additional fossil fuel-derived CO2 to the upper ocean. We observed a significant change in surface water δ13C over a short time period (2 days) that was the result of a change in the shallow surface water mass. This change emphasizes the need for caution when conducting seasonal studies. © 1992.

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